Table 1 Baseline characteristics between weaning-failure and weaning-success groups

Male, n (%)

35, 72.9%

24, 64.9%

Age, years

70 ± 14

77 ± 13

Height, cm

161.2 ± 5.8

163.5 ± 6.9

Weight, kg

59.7 ± 6.5

57.2 ± 6.1

Body mass index

23.0 ± 2.8

21.6 ± 3.3

Temperature, ℃

36.9 ± 0.5

37.7 ± 3.8

Systolic blood pressure, mmHg

107 ± 40

103 ± 38

Diastolic blood pressure, mmHg

63 ± 26

57 ± 21

Heart rate, beats per minute

107 ± 25

107 ± 31

Respiratory rate, breaths per minute

24 ± 8

25 ± 9

Tidal volume, ml

349.0 ± 37.1

373.2 ± 36.9

PEEP, cmH₂O

4.7 ± 1.2

4.6 ± 1.2

pH

7.3 ± 0.1

7.3 ± 0.2

PaO₂, mmHg

116.1 ± 75.8

105.5 ± 59.6

PaCO₂, mmHg

39.0 ± 14.3

43.5 ± 19.2

PaO₂/FiO₂ ratio

237.49 ± 130.11

222.37 ± 139.45

Na, mmol/L

139.7 ± 7.5

141.0 ± 6.7

K, mmol/L

4.2 ± 0.9

4.1 ± 0.8

Ca, mmol/L

2.1 ± 0.2

2.0 ± 0.2

Mg, mmol/L

1.0 ± 0.2

1.0 ± 0.1

P, mmol/L

1.2 ± 0.3

1.3 ± 0.2

Albumin, g/L

30.4 ± 3.1

27.6 ± 4.3

Hemoglobin, g/L

97.7 ± 18.5

86.9 ± 12.7

White blood cell, × 10⁹/L

14.3 ± 7.5

14.0 ± 11.3

Creatinine, μmol/L

198.7 ± 205.0

258.2 ± 238.3

NT-proBNP*, pg/ml

2436.00 (465.25–12,375.00)

2994.50 (1841.50–5534.00)

APHACHE II

23.3 ± 7.7

24.3 ± 7.3

SOFA score

4.4 ± 1.6

5.6 ± 2.3

Comorbidity

Hypertension, n (%)

19, 38.0%

14, 36.8%

Diabetes mellitus, n (%)

7, 14.0%

8, 21.1%

Coronary heart disease, n (%)

3, 6.0%

15, 39.5%

Chronic kidney disease, n (%)

6, 12.0%

11, 29.0%

COPD, n (%)

10, 20.0%

12, 31.6%

Tumor, n (%)

2, 4.0%

6, 15.8%

Sepsis, n (%)

21, 42.0%

24, 63.2%